Facile synthesis of 6-cyano-9-substituted-9H-purines and their ring expansion to 8-(arylamino)-4-imino-3-methylpyrimidino[5,4-d]pyrimidines
作者:Amal Al-Azmi、Brian L. Booth、Robert A. Carpenter、Alice Carvalho、Elodie Marrelec、Robin G. Pritchard、M. Fernanda J. R. P. Proença
DOI:10.1039/b106539b
日期:2001.10.11
6-Cyano-9-substituted-9H-purines were prepared in a high yielding, one-step process by refluxing triethyl orthoformate or triethyl orthopropionate with the corresponding (Z)-N1-(aryl- or benzyl)-N2-(2-amino-1,2-dicyanovinyl)formamidines. Attempted reaction of these cyanopurines with aqueous methylamine furnished 8-(arylamino)-4-imino-3-methylpyrimidino[5,4-d]pyrimidines, by attack at the imidazole ring rather than addition to the 6-cyano group. All compounds have been fully characterised by spectroscopic data and an X-ray crystal structure determination has been carried out on the 8-(4-methoxyanilino)-4-imino-3-methylpyrimidino[5,4-d]pyrimidine.
6-氰基-9-取代-9H-嘌呤通过将三乙基正形酸酯或三乙基正丙酸酯与相应的(Z)-N1-(芳基或苄基)-N2-(2-氨基-1,2-二氰基乙烯)氨基甲酰胺在回流条件下反应制备,反应产率较高。这些氰基嘌呤与水合的甲胺反应时,生成了8-(芳氨基)-4-亚氨基-3-甲基吡啶并[5,4-d]吡啶,反应发生在咪唑环上,而不是对6-氰基进行加成。所有化合物均已通过光谱数据得到全面表征,并对8-(4-甲氧基苯胺基)-4-亚氨基-3-甲基吡啶并[5,4-d]吡啶进行了X射线晶体结构的测定。